防治苹果颈腐病的果园试验     

Harr.  DC  杨莹 《国外农学:果树》1989,(1):40-43

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A case of marked and unresponsive obesity          下载免费PDF全文

Forbes DC  White DE 《The Canadian veterinary journal. La revue veterinaire canadienne》1987,28(4):187

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Bile duct obstruction secondary to chronic pancreatitis in seven dogs          下载免费PDF全文

Cribb AE  Burgener DC  Reimann KA 《The Canadian veterinary journal. La revue veterinaire canadienne》1988,29(8):654-657

Seven icteric dogs were determined to have bile duct obstruction secondary to chronic pancreatitis. All dogs had histories of intermittent vomiting and diarrhea. Alkaline phosphatase and alanine aminotransferase activities and total bilirubin concentrations were markedly elevated. Diagnosis was based on exploratory laparotomy and histological examination. Each dog had a 3 to 10 cm mass in the body of the pancreas and obstruction of the common bile duct. Three dogs treated with pancreatectomy, gastrojejunostomy, and cholecystojejunostomy died within five weeks. Three dogs treated with conservative surgical procedures were alive at 8, 16, and 26 months postoperatively. One dog was euthanized because of suspected neoplasia. Hepatic enzyme activity and bilirubin levels decreased markedly in the surviving dogs. Histological examination of the pancreatic masses indicated chronic pancreatitis. Hepatic biopsies revealed evidence of cholestasis. Chronic pancreatitis should be included in the differential diagnoses of icterus, bile duct obstruction, and masses in the pancreas.  相似文献   

The pathogenesis of excessive wear in the deciduous teeth of sheep     

Thurley DC 《New Zealand veterinary journal》1984,32(3):25-29

The teeth and various supporting and ancillary tissues were examined post mortem from two flocks of sheep, one of which had previously shown high deciduous incisor wear. Sheep were killed in groups selected on clinical signs at equivalent ages from birth to 116 weeks of age. At the end of this time the lengths of clinical crowns of the remaining deciduous incisor teeth in the high wear flock were not measurable, whereas the other flock had up to 5.5 mm in visible crown. Using the cingulum as a marker, measurements were made from extracted teeth of the attrition of the crown and size of the root. The tooth root did not grow substantially longer after the 13th week of the sheep;s life. Wear facets were just visible in some sheep at six weeks. More rapid wear occurred three times in the high wear flock. The first of these was relatively small and occurred between the 13th and 27th week of age in I1 and I2. The second was larger and occurred between the 38th and 57th week of age in the winter/spring period. A third period of wear, which was not measured from the cingulum, because this structure had by then been worn away, was seen in the remaining deciduous teeth between the ages of 91 and 110 weeks of age, i.e., during the second winter and spring. In the low wear flock the first of these periods of wear did not occur, the second was of shorter duration and smaller size, and the third equivocal. Eruption of the teeth after the 6th week was principally passive. There was no difference in the degree of wear of the molar teeth from the two flocks. Histological examination showed that the wear was compensated for by the deposition of reparative dentine in the pulp cavity. This usually gave the appearance of an ordered process. However, when wear was excessively rapid, a different, less orderly form of reparative dentine was laid down. In a few cases the reparative process was not fast enough, and a connection developed between the mouth and the pulp causing pulpitis. There was no histological evidence that the supportive tissues of the teeth, or the upper dental pad, contributed to the excessive wear.  相似文献   

Max planck: the dllemmas of an upright man     

Cassidy DC 《Science (New York, N.Y.)》1986,233(4766):896

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Erosion of the non-occlusal surfaces of sheeps' deciduous teeth     

Thurley DC 《New Zealand veterinary journal》1985,33(9):157-158

Major erosion of the labial or lingual surfaces was seen in histological sections of deciduous teeth from three of 208 sheep from two farms. In one, the erosion extended through both the enamel and the dentine and thus exposed the pulp cavity which had developed pulpitis. In the other cases the erosion affected the cementum and dentine of the tooth root, and did not penetrate as far as the pulp cavity. Dentine proliferation occurred on the adjacent pulpal surface, however, although pulpitis was not evident.  相似文献   

Wastage and disease in Bay of Plenty dairy herds     

Anderson DC 《New Zealand veterinary journal》1985,33(5):61-65

Information on disease incidence and herd wastage was collected from 36 farms supplying the Rangitaiki Plains Dairy Company over a two-year period from June 1981 to May 1983. These herds contained 7050 milking cows and 1460 yearlings. Although 33.5% of calves horn were reared, only 21.7% entered the herd. The average wastage rate over the two seasons was 22.6%. This included a 2.5% death-rate. Main reasons for culling were infertility (6.3%), low production (3.7%) and mastitis (2.3%). Only 0.8% of cows died or were culled because of bloat and 0.4% from each of facial eczema and metabolic diseases. Treatments were administered by farmers or veterinarians to 18.8% of the cows for mastitis, to 3.9% for metabolic diseases and to 3.6% for lameness. In total, 34.6% of cows received treatment for disease. Wide differences were noted in the proportion of cases of different diseases for which veterinarians were consulted. These ranged from 83.6% for scours to 3.8% for mastitis. As well as confirming or quantifying the relative importance of various diseases and causes of wastage, the survey highlighted the problems in collecting reliable data from herd owners on the events in their herds.  相似文献   

Engineering education     

Drucker DC 《Science (New York, N.Y.)》1983,222(4622):375

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Problems of u.s. Industry: made in america     

Mowery DC 《Science (New York, N.Y.)》1989,246(4937):1642-1643

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The association between pupil sizes and blood constituents in cows with parturient paresis          下载免费PDF全文

Fenwick DC 《The Canadian veterinary journal. La revue veterinaire canadienne》1989,30(5):426-429

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